high enough above the window, physical contact is avoided at angular 
deflection extremes, but the cone through which the camera lens 
"looks", swings beyond the limits of a 16" x 20" window. The 
result is optical or camera cut-off, with the severity depending 
upon the direction and the amount of angular deflection. 
In one of the frames examined, it appeared that the aircraft 
had rolled clockwise (looking forward) and cut off was seen on the e é 
right edge of the frame. In another photo, the aircraft had rolled 
counter-clockwise, and cut-off appeared on the left edge of the 
frame. In Frame #0045, the aircraft had pitched nose up, thereby 
producing a 3-way 'wedge" effect, with cut-off on both sides and 
the trailing edge. (A Xerox copy of this frame is shown in Figure 5). 
When the mount was not operating, no camera deflection relative to 
the window occurred, and no cut-off was experienced. To illustrate, 
Sgt. Garcia showed negatives from a test mission flown 2 days later 
on 19 November 1967, using KC-3 camera #1 (Lens Serial #12) installed e + 
in the same camera station, with the ART-25 mount not in operation. 
No cut-off appeared in any of the frames thus exposed. A typical 
example was Frame #0059, (A Xerox copy of which is shown in Figure 6). 
It was recommended that the KC-3 be used in a stabilized mount over 
the 40" diameter window in the Convergent Camera Station, this 
window being big enough to preclude cut-off under any of the cited 
  
conditions.